Final Fantasy Hacktics

Hello!  Sorry if this is a repost, I'm new to this site and couldn't really find much on it.  I've been trying to add Zodiac monsters and other characters like Elmdore to my party through the use of LionEditor.  They seem to work great in battle, no noticeable glitches, however- immediately after a battle ends I just go through the desertion screen and they are no longer available.  Any help would be great!  Thank you!